Alongshore transport of a toxic phytoplankton bloom in a buoyancy current: Alexandrium tamarense in the Gulf of Maine

Franks, Peter J. S.; Anderson, Donald M.

doi:10.1007/bf00349739

Cited by 146 publications

(75 citation statements)

References 17 publications

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“…In particular, nutrient concentrations associated with Alexandrium blooms in the Western Gulf of Maine -specifically nitrogen -can be very low; (<2 uM DIN) ) and could be potentially limiting for growth of Alexandrium in the field. In turn the physical environment, for example sea surface temperature, riverine inputs and wind forcings, also may be a potential factor in regulating the distribution and abundance of Alexandrium spp (Franks et al 1992). In addition, small-scale turbulence or circulation can also directly effect a cell's vertical progress (vertical migration) in the environment due to cell dispersion, disorientation and possible loss of flagella (Kamykowski 1995).…”

Section: Discussionmentioning

confidence: 99%

“…The rapid decline in cell abundance that was observed at many stations could be due to decreased nutrient availability (specifically N) or another environmental factor such as wind forcing or upwelling that would physically move the bloom away from the study area (Franks et al 1992). In the former case, the decrease in N availability should result in the loss of cells due to cyst formation (Anderson 1998 (Anderson et al 1984;Anderson and Lindquist 1985).…”

Section: (> •mentioning

confidence: 99%

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Physiological and behavioral diagnostics of nitrogen limitation for the toxic dinoflagellate Alexandrium fundyense

Poulton¹

2000

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Section: Discussionmentioning

confidence: 99%

Section: (> •mentioning

confidence: 99%

Physiological and behavioral diagnostics of nitrogen limitation for the toxic dinoflagellate Alexandrium fundyense

Poulton¹

2000

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“…30 km northeast of Cape Ann, although the spatial extent of the deposit was not delineated fully. Hydrographic survey data revealed cell populations in the coastal waters with peak concentrations on the order of hundreds to thousands of cells per liter, generally associated with plumes of fresh water emanating from riverine sources (Franks and Anderson, 1992a). In fact, the north-to-south progression of toxicity within the western Gulf of Maine (south of Penobscot Bay) can be explained by alongshore transport of cells in coastally-trapped river plumes (Franks and Anderson, 1992b).…”

Section: Introductionmentioning

confidence: 99%

Mechanisms regulating large-scale seasonal fluctuations in Alexandrium fundyense populations in the Gulf of Maine: Results from a physical–biological model

McGillicuddy

Anderson

Lynch

et al. 2005

Deep Sea Research Part II: Topical Studies in Oceanography

149

132

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Observations of Alexandrium fundyense in the Gulf of Maine indicate several salient characteristics of the vegetative cell distributions: patterns of abundance are gulf-wide in geographic scope; their main features occur in association with the Maine Coastal Current; and the center of mass of the distribution shifts upstream from west to east during the growing season from April to August. The mechanisms underlying these aspects are investigated using coupled physical-biological simulations that represent the population dynamics of A. fundyense within the seasonal mean flow. A model that includes germination, growth, mortality, and nutrient limitation is qualitatively consistent with the observations. Germination from resting cysts appears to be a key aspect of the population dynamics that confines the cell distribution near the coastal margin, as simulations based on a uniform initial inoculum of vegetative cells across the Gulf of Maine produces blooms that are broader in geographic extent than is observed. In general, cells germinated from the major cyst beds (in the Bay of Fundy and near Penobscot and Casco Bays) are advected in the alongshore direction from east to west in the coastal current. Growth of the vegetative cells is limited primarily by temperature from April through June throughout the gulf, whereas nutrient limitation occurs in July and August in the western gulf. Thus the seasonal shift in the center of mass of cells from west to east can be explained by changing growth conditions: growth is more rapid in the western gulf early in the season due to warmer temperatures, whereas growth is more rapid in the eastern gulf later in the season due to severe nutrient limitation in the western gulf during that time period. A simple model of encystment based on nutrient limitation predicts deposition of new cysts in the vicinity of the observed cyst bed offshore of Casco and Penobscot Bays, suggesting a pathway of re-seeding the bed from cells advected downstream in the coastal current. A retentive gyre at the mouth of the Bay of Fundy tends to favor re-seeding that cyst bed from local populations.

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“…In some cases, wind, weather, tidal or other hydrographic conditions have been related to initiation of nearshore blooms by delivery of the organisms into the bloom region (Balch, 1981;Lindahl, 1983;Taylor et al 1994). In some other cases, transport of phytoplankton blooms from offshore to inshore regions, longshore transport of blooms from one coastal region to another has also been documented (Franks and Anderson, 1992).…”

Section: Bloom Initiationmentioning

confidence: 99%

Harmful Algal Blooms: Physiology, Behavior, Population Dynamics and Global Impacts- A Review

Al-Ghelani

Alkindi

Amer

et al. 2005

SQU Journal for Science

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Harmful, toxic algae are now considered as one of the important players in the newly emerging environmental risk factors. The apparent global increase in harmful algal blooms (HABs) is becoming a serious problem in both aquaculture and fisheries populations. Not only has the magnitude and intensity of public health and economic impacts of these blooms increased in recent years, but the number of geographic locations experiencing toxic algal blooms has also increased dramatically. There are two primary factors causing HABs outbreaks. The natural processes such as upwelling and relaxation, and the anthropogenic loading resulting in eutrophication. However, the influence of global climate changes on algal bloom phenomenon cannot be ignored. The problem warrants development of effective strategies for the management and mitigation of HABs. Progress made in the routine coastal monitoring programs, development of methods for detection of algal species and toxins and coastal modeling activities for predicting HABs reflect the international concerns regarding the impacts of AL-GHELANI, H.M., ALKINDI, A.Y.A, AMER, S. AND AL-AKHZAMI, Y.K. 2HABs. Innovative techniques using molecular probes will hopefully result in development of rapid, reliable screening methods for phycotoxins and the causative organisms.

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Alongshore transport of a toxic phytoplankton bloom in a buoyancy current: Alexandrium tamarense in the Gulf of Maine

Cited by 146 publications

References 17 publications

Physiological and behavioral diagnostics of nitrogen limitation for the toxic dinoflagellate Alexandrium fundyense

Physiological and behavioral diagnostics of nitrogen limitation for the toxic dinoflagellate Alexandrium fundyense

Mechanisms regulating large-scale seasonal fluctuations in Alexandrium fundyense populations in the Gulf of Maine: Results from a physical–biological model

Harmful Algal Blooms: Physiology, Behavior, Population Dynamics and Global Impacts- A Review

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